Stop the ridable horse's saddle from complaining that it can't switch parent to the ragdoll when the horse dies. It doesn't seem to need to switch, so I'm letting it be destroyed silently with an override - same as existing behaviour, but without the logging. Fixes "SwitchedParent Missed horse.corpse" server log spam.
Removed cases where I was doing specific mutable state checks in trigger InterestedInObject calls, not realising that InterestedInObject is also checked to see if we should allow a collider to detect that it LEFT a trigger. Fixes spawning a car on top of yourself and then noclipping out of it causing the game to consider you still in the triggers.
Fix BasePlayer movement references on the server in TriggerPlayerForce and TriggerMount. Moved BasePlayer vars that aren't used on the server at all into BasePlayer-Client, so this mistake is now prevented from being made again.
Let the car chassis push and hurt triggers stay always on, since there are various situations where players may end up inside a vehicle - not all of them a case where the vehicle is on or even moving (e.g. Spawning as a sleeper underneath one after loading a save).
Mounted state isn't saved to a save file, so players can get stuck in vehicles on load, in their mounted position but not mounted. Quick fix: Ignore the vehicle layer in sleeper physics, so players fall through the vehicle instead of getting stuck in it.
Merge car central locking changes -> Main. New central locking system prevents players without a key from mounting a lockable car, but a driver can unlock the doors if desired once inside. Placeholder graphics for now. Protocol++.
Fixed vehicles with wheel colliders (minicopter, scrap transport heli) not being able to drive or fly into the Launch Site lowered area.
TerrainCollisionProxy scripts added to select colliders on the vehicles, and Terrain Triggers on Launch Site raised by around 2m to catch colliders above the wheels. Also modified TerrainCollisionProxy to be server-only.